ULH oil pump rebuild

[Pete Engelman]

I bought a Colony made in the USA rebuild kit for a 1941 ULH oil pump. I measured the pressure regulator spring and found it to be the same length as the free length spec in the manual, but the ball check springs are nearly a half inch longer than the manual recommends. I wonder if this could pose a problem at idle as the ball check to the pinion shaft/crank pin is to open at about 1.5 PSI. I don't know if this oil pump will create enough pressure at idle to open this ball check with the longer spring?
The old springs were collapsed by 0.1'' with wear on the spring itself. I'd rather not use them in case they break on the worn spots. I tried to stretch them to OEM length but of course over stretched them.
I wonder if I should cut the new springs to the service manual free length spec and put the factory end of the spring against the ball check and the cut end into the cap.
Thanks for any input.
Pete:::::::::::;;;;;;;;;;;;;

[T. Cotten]

Once the installed length is determined, Pete,...

I would compare the tensions of your original springs with the repops.

TNSNGAGE.jpg

....Cotten

[Pete Engelman]

Thanks Cotten
I put the pressure regulator through the spring then closed the spring against my digital scale until the tip of the regulator was just above the scale plate. These new springs require an extra 20 grams or about 3/4 of an ounce force to collapse the same distance than the OEM springs. I thought about cutting the new springs to 1.30'' but am trying to find the proper springs. Cutting will be last ditch effort.
Thanks
Pete::::::::;;;;;;;;

[T. Cotten]

Springs can be diabolical, Pete,...

I wouldn't sacrifice anything until reading them at their operating length.

(Comparing exact diameter, wire gauge, and number of winds are more clues.)

....Cotten

[Pete Engelman]

Thanks Cotten
I think I'll try and get the proper springs. I could likely get away with using the OEM springs. I've stretched them a bit past OEM free length but that would likely be better than these extra long ones.
Pete:::;;;;;;;;;;

[T. Cotten]

Thanks Cotten
I think I'll try and get the proper springs. I could likely get away with using the OEM springs. I've stretched them a bit past OEM free length but that would likely be better than these extra long ones.
Pete:::;;;;;;;;;;

I guess if you tortured them, we will never know a baseline, Pete.

Otherwise the repops might have been slightly, but evenly, weaken'd with a heatlamp or hair dryer.

(The smaller the spring, the more diabolical.)

Good luck getting anything 'proper' anymore!

...Cotten

[DEEBS47Chief1991]

I don't think it's a good idea to cut the spring.

Opera Snapshot_2024-08-01_164139_www.google.com.png

[DEEBS47Chief1991]

Opera Snapshot_2024-08-01_164523_www.google.com.png

[Pete Engelman]

Thanks Cotten and DEEB
measured the OEM springs prior to stretching them they were 0.1'' compressed so 1.023'' I examined the old springs under a microscope and the wear is only shined up hard to determine with naked eye. I think the OEM will be fine I'll give my friend the new springs and if it wet sumps he can try the new set
Pete:::::;;;;;;;